Alzheimer's disease is a neurodegenerative disease condition with a complex etiology.
Alzheimer's disease was first publicly reported in 1906 by the German psychiatrist Alois Alzheimer, but it took 70 years to determine that Alzheimer's disease is a type of progressive dementia. 
This disease results in irreversible deterioration of the physical and mental condition of the affected individual which further worsens over time.
Direction to use
Different research studies used different extracts of Black seeds to get a higher concentration of its bioactive phytochemicals. Moreover, the equivalent dose of Black seed is much higher than the Black seed oil.  One teaspoon of Black seed oil is equivalent to 2.5 teaspoons of Black seeds.  Therefore, instead of raw Black seeds, Black seed oil is a good option to get a concentrated form for all the active ingredients.
Some convenient recipes for Black seed oil
The taste of Black seed oil is not very much acceptable because of its bitter flavor. Although, some quick recipes of Black seed oil can help to blunt its taste.
• Combine one teaspoon of Black seed oil with equal amount of honey.
• Mix one teaspoon of Black seed oil with boiled mint.
• Mix one teaspoon of Black seed oil with a green smoothie or fruit juice to mask its taste and flavor.
• A blend of Black seed oil and basil oil can provide a better result. [11, 12]